Evolution of the genetic code.

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The Genetic Code Is One in a Million (1998, background): “This may well be the result of selection favoring those codes that minimized the average phenotypic effects of single-point mutations or mistranslations (see, e.g., AlfSteinberger 1969; Epstein 1966; Goldberg and Wittes 1966; Sonneborn 1965; Woese 1965, 1973; Woese et al. 1966).”
Collective evolution and the genetic code. (2006, background): “What we imply by ambiguity here is inherent in the concept of group codon assignments, where a group of related codons is assigned as a whole to a corresponding group of related amino acids[3].”
Aminoacyl-tRNA Synthetases, the Genetic Code, and the Evolutionary Process (2000, background): “However, a computer simulation study (26) showed that the assumptions of the first model are unlikely to lead to a synonym order in the code that is almost entirely confined to a single codon position—a type of order that is consistent with, if not predicted by, the second model (which also suggests”
Origin and evolution of the genetic code: the universal enigma (2008, background): “It is possible to distinguish the ‘‘lethal-mutation’’ hypothesis (64, 65) under which the standard code evolved to minimize the effect of point mutations and the ‘‘translation-error minimization’’ hypothesis (66, 67) which posits that the most important pressure in 101 EVOLUTION OF THE GENETIC CODE”